diff --git a/README.md b/README.md
index 5ad7dc9..e7cc362 100644
--- a/README.md
+++ b/README.md
@@ -215,10 +215,22 @@ doas apk install element-desktop
 
 ### Sleep
 
-Laptop goes to sleep after some idle period. When it wakes up, the root fs is readonly, meaning that I have to restart the laptop.
+With default settings, laptop goes to sleep after some idle period. When it wakes up, the root fs is readonly, meaning that I have to restart the laptop.
 
 Adding `acpiphp.disable=1` and `pcie_aspm=off` to grub config does not solve the issue.
 
+Disabling S0ix in UEFI only made things worse: even though `cat /sys/power/mem_sleep` reported that S3 (deep) is default,
+after system goes to sleep it is impossible to wake it up, it does not react to key or power button presses.
+
+What did solve the issue was:
+* reenable S0ix in BIOS,
+* `doas apk add linux-firmware-amdgpu`,
+* editing `GRUB_CMDLINE_LINUX_DEFAULT` in `/etc/default/grub` to add the following options:
+`acpiphp.disable=1 pcie_aspm=off acpi_osi='Windows 2020' iommu=soft`.
+
+Now after waking up (after being suspended with `doas pm-suspend`) root fs is still readwrite.
+But network disappears sometimes after wakeup.
+
 ### WiFi
 
 At the moment Linux kernel does not support Qualcomm NFA725.